22078791 has 16 divisors (see below), whose sum is σ = 37382400. Its totient is φ = 12616344.

The previous prime is 22078739. The next prime is 22078807. The reversal of 22078791 is 19787022.

It is not a de Polignac number, because 22078791 - 2⁷ = 22078663 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22073791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58221 + ... + 58598.

It is an arithmetic number, because the mean of its divisors is an integer number (2336400).

Almost surely, 2^22078791 is an apocalyptic number.

22078791 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22078791 is a deficient number, since it is larger than the sum of its proper divisors (15303609).

22078791 is a wasteful number, since it uses less digits than its factorization.

22078791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116835 (or 116829 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 22078791 is about 4698.8074018840. The cubic root of 22078791 is about 280.5380428256.

The spelling of 22078791 in words is "twenty-two million, seventy-eight thousand, seven hundred ninety-one".